產(chǎn)品內容介紹
1C31232G02直流電壓模塊
B875–111和B877–111將在輸入。模數轉換的分辨率取決于輸入使用配置開(kāi)關(guān)組選擇的范圍和輸出格式。使用Modicon編程器調用I/O中指定的相應寄存器地圖改變輸入信號，并檢查寄存器內容是否正確變化。有關(guān)快速啟動(dòng)示例，請參閱下表。樣品平均輸入數據輸出數據可以通過(guò)模塊中的低通數字濾波器進(jìn)行處理平均并消除轉換后的輸入模擬信號中的任何低頻噪聲
數據數字濾波算法為：哪里Xn=當前輸入數據樣本
Yn=新輸出過(guò)濾器數據值Yn-1=先前輸出過(guò)濾器數據值。
數字濾波算法近似于經(jīng)典的指數響應與截止頻率Fc和時(shí)間常數Tc相關(guān)的特性平均樣本數N和吞吐量時(shí)間T
“N”為用戶(hù)使用DIP開(kāi)關(guān)選擇（8,16,32）。吞吐量時(shí)間“T”等于10msB875–111和20ms，適用于B877–111。）與任何濾波器一樣，用戶(hù)必須確定時(shí)間常數和截止頻率適用于特定應用。下面是一個(gè)參考表，大致如下各種用戶(hù)設置的數字濾波器特性。應用在許多應用中，模擬信號以單位（點(diǎn)、，加侖/秒、攝氏度、英尺/分鐘等）監視或報告打印輸出。
模擬輸入可以縮放為工程單位。
為了演示該技術(shù)，假設快速啟動(dòng)示例中的0-10 V信號
表示-40-+140°F的溫度。請參閱下圖顯示信號與溫度的關(guān)系。
信號與溫度關(guān)系圖工程單位范圍是什么？在本例中，它是140-（-40）=180用計算器將這個(gè)數字除以7500。180/7500 = .024將此數字乘以10000，得到乘法塊常數240。
將模擬輸入乘以240。高階結果寄存器將包含范圍加上或減去Y截距（本例中為-40）以獲得答案。校準工具模擬輸入模塊在出廠(chǎng)前進(jìn)行校準。
為了確保根據模塊精度，應每年定期校準微調罐。
校準模擬輸入模塊需要以下工具和材料：精度為0.0001 V、電壓為10 V的精密數字讀數伏特計規模一把1/8英寸的薄刃螺絲刀。
一把1/4英寸十字螺絲刀。一種粘合劑（如Loctite或Glyptol），用于固定裝飾罐調整螺釘。
Module Checkout
The B875–111 and B877–111 will perform an analog to digital conversion on the inputs. The resolution of the analog to digital conversion is dependent upon the input range and output format selected with the configuration switch bank. Using a Modicon programmer, call up the appropriate registers assigned in the I/O Map. Vary the input signal and check that the register content varies correctly. Refer to the following table for the quick-start example. Sample Averaging Input Data The output data can be processed by a low-pass digital filter in the module to average out and remove any low-frequency noise in the converted input analog data. The digital filter algorithm is: where Xn = Current input data sample Yn = New output filter data value Yn-1 = Previous output filter data value. The digital filter algorithm approximates a classical exponential response characteristic with both the cut-off frequency, Fc, and the time constant, Tc, related to the number of samples to be averaged, N, and the throughput time, T. The "N" is user selected (8,16,32) with DIP-switches. Throughput time,"T", equals 10ms for the B875–111, and 20ms, for the B877–111.)As with any filter, the user must establish what time constant and cut-off frequency is suitable for the specific application. Below is a reference table that approximates the digital filter characteristics for various user settings.
Application
In many applications, analog signals are provided to operators in units (points, gallons per second, degrees C, feet per minute, etc.) via LED displays, CRT monitors or report printouts. An analog input can be scaled to engineering units. To illustrate the technique, assume that the0—10 V signal in the quick-start example represents a temperature from -40—+140°F. Refer to the following illustration showing the signal to temperature relationship. Signal to Temperature Relationship Diagram What is the engineering unit range? In this example it is 140 - (-40) =180 Divide this number by 7500 using a calculator. 180/7500 = .024 Multiply this number by 10,000 to obtain the multiply block constant of 240. Multiply the analog input by 240. The high-order result register will contain the range. Add or subtract the Y intercept (-40 in this example) to obtain the answer.Calibration Tools The analog input module is calibrated at the factory prior to shipment. To ensure the module’s accuracy, the trim-pot should be calibrated regularly on a yearly interval. The following tools and materials are needed to calibrate an analog input module: A precision digital readout voltmeter with an accuracy of 0.0001 V on a 10 V scale. A 1/8-inch bit, thin-blade screwdriver. A 1/4-inch Phillips-head screwdriver. An adhesive (such as Loctite or Glyptol) to secure trim-pot adjustment screws.
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